<div class="tags">
  <foo>1</foo>
  <FOO>2</FOO>
  <fooBAR>3</fooBAR>
  <fooBar>4</fooBar>
  <foo_bar>5</foo_bar>
  <foo-bar>6</foo-bar>
  <foo:bar>7</foo:bar>
  <foo class="bar">8</foo>
  <fooBAr_baz:boom_bar>9</fooBAr_baz:boom_bar>
  <foo13>10</foo13>
  <foo2u>11</foo2u>
</div>
<div class="classes">
  <p id="baz" class="foo bar">
  </p>
  <div class="fooBar">a</div>
  <div class="foo-bar">b</div>
  <div class="foo_bar">c</div>
  <div class="FOOBAR">d</div>
  <div class="foo16">e</div>
  <div class="123">f</div>
  <div class="foo2u">g</div>
  <div class="bar" id="ba'z1">h</div>
  <div id="foo" class="bar">i</div>
</div>
